<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
    <meta charset="UTF-8">
    <title>弹性盒模型</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
    <link rel="stylesheet" href="FlexBox.css">
</head>
<div class="box">
    <div class="circle"></div>
    <div class="circle"></div>
</div>
<body>

</body>
</html>
